Core Shell Particle Synthesis with Oxygen Ratio Control
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Solution Overview
Problem
The synthesis of core shell particles with high luminous efficacy and narrow emission half-width is challenging due to fluctuations in synthesis conditions, leading to variations in composition and particle size, which affect emission characteristics.
Innovation Solution
A core shell particle structure is developed with a core containing a Group III element and a Group V element, surrounded by multiple shell layers, where the molar ratio of oxygen to the Group III element is controlled to 6.1 or less, using specific synthesis steps and atmospheres to minimize surface oxidation and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional synthesis methods are used to produce core shell particles, then production can be achieved with standard procedures, but luminous efficacy fluctuates and emission half-width becomes wide due to variations in synthesis conditions
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molar ratio of oxygen to Group III element (keeping it at 6.1 or less) and controlling particle size within specific ranges (2-50 nm). By adjusting these parameters during synthesis, the method achieves high luminous efficacy and narrow emission half-width, resolving the contradiction between reliability and manufacturing precision.
Solution Approach 2:
The patent implements local quality by creating a core-shell structure where the core contains Group III-V semiconductor materials with specific composition, and the shell provides protective and functional properties. This localized differentiation of material properties within the particle structure enables high luminous efficacy while maintaining precise emission characteristics.
2Adaptability or versatility
If synthesis conditions are varied to explore different compositions, then material diversity is achieved, but particle size uniformity decreases leading to broader emission spectra
Solution Approach 1:
The patent uses parameter changes to control particle size within the specific range of 2-50 nm while maintaining composition flexibility. By establishing clear parameter boundaries (oxygen/Group III molar ratio ≤ 6.1, particle size 2-50 nm), the method achieves both adaptability in composition and precision in particle size uniformity.
Solution Approach 2:
The patent applies preliminary action by pre-establishing optimal synthesis conditions and parameter ranges before actual particle production. By determining the appropriate oxygen to Group III element ratio and particle size range in advance, the method ensures both compositional versatility and size uniformity are achieved systematically.
3Ease of manufacture
If surface oxidation is allowed to occur during synthesis, then synthesis process is simpler, but surface defects increase reducing luminous efficacy
Solution Approach 1:
The patent applies inert atmosphere by controlling the synthesis environment to prevent surface oxidation of the core shell particles. By maintaining an inert or controlled atmosphere during synthesis, the method avoids surface defects that would reduce luminous efficacy, while still keeping the process relatively simple through atmospheric control rather than complex surface treatment steps.
Solution Approach 2:
The patent converts the potential harm of oxidation into a benefit by precisely controlling the oxygen to Group III element molar ratio to be 6.1 or less. This controlled oxygen presence prevents excessive oxidation and surface defects, transforming what could be a harmful factor into a controllable parameter that enhances luminous efficacy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in core shell particles with enhanced luminous efficacy and narrowed emission half-width, achieved through controlled synthesis conditions that suppress surface oxidation and defect formation, leading to uniform particle size and improved emission characteristics.
Implementation Method 1
a coordination molecule in at least a part of an outermost surface
Implementation Method 2
at least oxygen is detected by X-ray photoelectron spectroscopy analysis, and a molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis
Data Source
AI summary
An object of the present invention is to provide a core shell particle having high luminous efficacy and a narrow emission half-width; a method of producing the same; and a film formed of the core shell particle. The core shell particle of the present invention includes: a core which contains a Group III element and a Group V element; a first shell which covers at least a part of a surface of the core; a second shell which covers at least a part of the first shell; and a coordination molecule in at least a part of an outermost surface, in which at least oxygen is detected by X-ray photoelectron spectroscopy analysis, and a molar ratio of the oxygen to the Group III element contained in the core, which is acquired by X-ray photoelectron spectroscopy analysis, is 6.1 or less.